black carbon in the tropics · ppt file · web view2012-10-18 · avaps flight summary hs3 2012...
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AVAPS Flight Summary
HS3 2012
NOAA ESRL
Gary WickRyan SpackmanDarren Jackson
Dave Costa
NCAR
Terry HockDean LauritsenCharlie MartinXuanyong Xu
NOAA AOML
Michael BlackJason Dunion
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Dropsonde Observations
Flight Target Sondes Comments
5-6 Sep 2012 Leslie 30 Transit, Limited Ku
11-12 Sep Nadine 34 System fault -– parachute cap anomaly;RF noise issue emerges in flight
14-15 Sep Nadine 70 RFI continues
19-20 Sep Nadine 76 RFI continues
22-23 Sep Nadine 58 RFI continues
26-27 Sep Nadine 75 RFI improves
Total Sondes 343
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Dropsonde Observations
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Dropsonde Achievements
• First operations with Ku communications:Download raw D-files from AV-6 in flightReal-time ASPEN processingNear real-time posting of skew-T plot to MTSNear real-time transmission to GTSReference to HS3 sonde data in NHC forecast discussions for Nadine
• Plans for parallel GFS model runs• Dropsonde deployment flexibility in various Atlantic
FIRs (e.g., box module insertion in real time)
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AVAPS Lessons LearnedFlight Ops
1 – Two AVAPS team members required in the PMOF:Dedicated drop operator necessary because of intensive commsAVAPS science seat coordinates drop pattern and any changes with mission scientists and shuttles data to processing team
2 – Additional team required for real-time processing
Instrument Issues
1 - Parachute cap manufacturing anomaly being addressed
2 – RF noise interference issue is under investigation
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Science Directions• Tropical-extratropical transition: trough interactions• Aerosol-cloud-precipitation interactions: Role of SAL• HS3 science investigations: Build collaborations with
investigator teams that are using the dropsonde data
Courtesy of G. Wick, NOAA
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Sep 26 Nadine Mission
Dry, stable SAL
Dry, stable continental air
Moist core
How could Nadine survive and even flourish in such a dry, stable environment? Is the core within a “protected pouch”? How does convection overcome the stable low-level environment and inversion? Are differences in SST and surface air temperature important to enhance surface fluxes?
Courtesy of M. Black, NOAA
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NASA Global Hawk – HS3 2012
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• Dropsonde RF Signal Strength vs Time for First 6 dropsHS3 2012: Case 1 – Science Flight #1 (transit)
Normal AVAPS ‘no signal’ noise floor
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• Dropsonde RF Signal Strength vs Time for First 6 dropsHS3 2012: Case 2 – Science Flight #2
Why has the ‘no signal’ noise floor increased on Drops 2 through 6 (shown here) and all subsequent drops?
Drop 1, the ‘Bermuda’ drop
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HS3 2012: Case 1 – Science Flight #1 (transit)• Two AVAPS 400 MHz Spectrum Analyzer data frames prior to takeoff• Note average noise floor jump from ~ -110 dBm to ~ -102 dBm• These plots are 6 seconds apart in time
UTC Time - 20:16:00 UTC Time - 20:16:06
approx mean: -110 dBmapprox mean: -102 dBm
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HS3 2012: Case 1 – Science Flight #1 (transit)• GH IWG1 data
prior to takeoff
UTC Time of cursor20:16:06
(same UTC time as 2nd AVAPS Spectrum Analyzer plot)
GH Takeoff ^
GH Pressure Altitude
GH Aircraft Heading 20:16:06 Z ground taxi begins
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HS3 2012: Case 1 – Science Flight #1 (transit)• Zoomed-in detail of previous IWG1 aircraft data slide UTC Time = 20:16:06
GH Aircraft Heading 20:16:06 Z ground taxi begins